dennis



Ma 5,1931; A. s. DENN'l-S 1,803,464

ATTACHMENT FOR CALCULATING MACHINES I 3 Filed July 17, 1929 e SheetS -Sheet 1 B H v 0 0 0 0 0, 0 w 0 O \N 0 0 Q r- @AQ g I H I O 43 [1 4? 00 p O O O N 0000000000 (3 OOOOOCDOOQG I; O ADOGOOOGOOO N 0 -0000000000 E 0 0 000000000 6 0 0000000000 0 O 0OOOO0OOOO 5m 0 0000000000 O O OOOOOOOOOO O O 0000000000 0 ORE Q May 5, 1931. A. s. DENNIS 1,803,464

ATTACHMENT FOR CALCULATING MACHINES Filed July 17, 1929 6 Sheets-Sheet 2 May 5, 1931.

6 Sheets-Sheet 3 Filed July 17, 1929 y 5, 1931- A. s. DENNIS 1,803,464

ATTACHMENT FOR CALCULATING MACHINES 7 Filed July 17, 1929 6 Sheets-Sheet 4 Eiwuemtoz @lbtommg May 5, 1931. A. s. DENNIS ATTACHMENT FOR CALCULATING IACHINES Filed July 17, 1929 SSheets-Sheet s May' 5, 1931. A. s. DENNIS 1,803,464

ATTACHMENT FOR CALCULATING MACHINES Filed July 17, 1929 e Sheets-Sheet 6 Patented May 5, 1931 UNITED STATES PATENT OFFICE ADOLPHUS S. DENNIS, OF OAKLAND, CALIFORNIA, ASSIGNOR TO MONROE CALCULATING MACHINE COMPANY, OF ORANGE, NEW JERSEY, A CORPORATION OF DELAWARE ATTACHMENT FOR CALCULATING MACHINES Application filed July 17,

V .This invention relates to attachments for calculating machines, and the principal object is to provide means for'connecting the driving motor to the clearing mechanism for effecting a motor driven clear-out of the countersor the accumulators or both at the will of the operator.

Another object is to provide suitable manipulative controlling means for the device.

Another object is to provide a cam means whereby the motor may be caused to effect clearing first of one set of dials and then of the other.

Another object is to provide a device of this nature which may be simple of construction, inexpensive to manufacture, and highly eflicient for the purpose for which it is designed.

Other objects will be apparent from the following detailed description, and be particularly pointed out in the appended claims. All of these objects are attained by means illustrated in the accompanying drawings, in which:

Fig. 1 is a somewhat diagrammatic top plan view of a machine embodying my invention.

Fig. 2 is a vertical sectional view'of the same, some parts of the calculating mechanism being omitted for the sake of clearness.

Fig. 3 is a side elevation of the motordriven clear-out mechanism per se.

Fig. 4 is a rear elevation of the same.

Fig. 5 is a vertical sectional view taken substantially on line 55 of Fig. 4.

Fig. 6 is a similar view taken substantially on line 6 6 of Fig. 4. v

Fig. 7 is a frontelevation of the motordriven clear-out mechanism per se, the keylevers being in section.

Fig. 8 is an end elevation of the carriage.

Fig. 9 is a sectional view taken substantially on line 9-9 of Fi 8.

Fig. 10 is an exploded-view of the hinge rod and certain of the parts which are mounted thereon.

Like characters of reference refer to like parts in all views.

This invention relates particularly to key 60 controlled means for elfecting motor drive of 1929. Serial N0. 378,942.

the clear-out mechanism of a calculating machine, and referring to the drawings in detail, 10 represents the casing and 11 the framework of a calculating machine. By way of illustrating the application of my invention, I have chosen to show the same as incorporated in a calculating machine of the well-known Monroe construction, although this is to be considered as merely illustrative, the invention being applicable to machines of various types. The actuating and clearing mechanism for the Monroe t pe of machine is fully set forth in the U. patent to G. C. Chase, No. 1,566,650, and the pending application of E. F. Britten, Jr. Ser. No. 337,073,.filed Feb. 2, 1929, and disclosures therein referred to, to all of which reference may be had for a complete disclosure of such mechanism.

The keyboard frame is shown at 12 and guides a plurality of manipulative members as follows: digit setting keys 13, zero keys 14, keyboard clearing key 15, repeat key 16, nonrepeat key 17, add operating key or plus bar 18, subtract operating key or minus bar 19, division lever 20, counter rotation-reversin shift lever 21, and multiplying keys 22. driving motor is shown at 23, a hand operating crank at 24, and a carriage at 25. The carriage 25 carries a plurality of accumulators 26 and two sets of counters indicated at 27 and 28, the counters 27 being of the nineteen point type (having no carrying mechanism and each bearing the nine significant digits running in reverse directions from a common zero, one set of significant digits being colored differently from the other), and the counters 28 being of the usual .ten-point type with carry mechanism.

The direction of rotation of the accumu-.

lators and counters 26, 27 and 28 is controlled by the manipulative members 18, 19, 20 and 21, the latter serving merely to reverse driving of the counters and not of the accumulators.

While the selecting and actuating means used in this type of machine has been fully set forth in said application Ser. No. 337,073 and other disclosures therein referred to, certain of the parts will be mentioned and their functions briefly stated. For a complete description reference may be had to the said application and disclosures.

Briefly, amounts set up in the digit setting keys 13, and thereby on differential actuating gears 29 (Fig. 2) are registered upon the differential registration wheels or accumulators 26 by the operation of dilferential gear shaft 30 and of shaft 31 whereon the tens-carry members are mounted, these shafts being connected by 11 ratio gears and elliptical gears (not shown). Power is derived from the motor 23 for rotating this mechanism, but the hand crank 24 may be retained as an alternative means of operation. Rotation of the differential actuating gears 29 effects registration on the accumulators 26 according to the setting of the digit keys 13, and each operation of the machine causes a rotation of one digit space of one counter of each of the sets 27 and 28, the denominational counter operated being controlled by the position of the carriage.

As described in my said application rota tion of a clearing handle indicated herein at 32 may be utilized to clear either the accumulators or counters. If the handle 32 is turned in a clockwise direction as viewed from the right-hand side of the machine it will effect the clearing of-the counters 27 and 28, while rotation of the handle 32 in a counter-clockwise direction as viewed from the right-hand side of the machine will effect clearing of the accumulators 26. Clearing handle 32 is mounted on a clearing shaft 33 and rotation of the shaft 33 eifects clearing of the counters or accumulators in the manner described in said application.

In the present application the shaft 33, Figs. 8 and 9, is provided with a gear 34 which meshes with a gear 35 on a stub shaft 36 rotatably mounted in the carriage frame 25. Inside the carriage frame, stub shaft 36 carries a gear 37 which. meshes with a gear 38 fast on the hinge rod 39 of the carriage 25. Hinge rod 39 is rotatable, and carries a collar 40 which is splined to the rod 39,- and is formed with 2. lug 41 which enters a recess 42 in a gear 43 on rod 39. The lug 41 co'acts with gear 43 so that driving of the gear as hereinafter set forth, will effect driving a hinge rod 39. The lug-41 is less in arcuate extent than recess 42, so that the rod 39 and collar 40 may have a slight rotary movement independently of the gear43. The gear 43 and collar 40 are retained against movement transversely of the machine by a bearing extension 44, Fig. 9, of the main framework, and an extension 45 of one of the subframes.

Supported by the framework of the machine .are two subframes 46 and 47 which are secured together and held in spaced relationship by tie rods 48. A shaft 49 rotatably mounted in the subframes 46 and 47 carries a gear 50 meshing with the gear 43. Gear 50 is not mounted directly on shaft 49 but is secured at one end on a sleeve 51 mounted on said shaft 49 and carrying two gears 52 and 53 which are fixed to said sleeve. Sleeve 51 is free to rotate on shaft 49.

Mounted on the driving shaft 54, Fig. 5, is a gear 55 which is constantly rotated as long as the motor is running. Meshing with the gear 55 is a gear 56 which is secured to one end of a stub shaft 57 having its bearing in the subframe 47. Secured to the other end of stub shaft 57 is a gear 58 which meshes with an idler gear 59 rotatable on a stud 60 secured to said subframe 47. The idler 59 meshes with a gear 61, the hub of which'is rotatably supported in member 47 and in the hub of this gear 61 is journalled one end of a shaft 62, the other end of which has its bearing in member 46. Gear 61 meshes with a gear 63 secured to one end of the shaft 49. Secured to the other end of shaft 49 is a gear 64 which meshes with an idler 65 mounted on a stud on the inside of subframe 46, which idler meshes with a gear 66 fixed on the inner end of shaft 62. In this manner of connecting the parts, gear 61 will turn in one direction and gear 66 and shaft 62 in the opposite direction.

Mounted on the shaft 62 are a counter clear-out clutch housing 67 andan accumulator clear-out clutch housing 68. The clutches are of the usual type in which a spring pressed pawl 69 is urged to engage a ratchet wheel or toothed member 7 O on the rotating driver but is normally prevented from doing so by a clutch control which engages the end of the pawl and normally holds it out of engagement with the ratchet, the engaged end of the pawl being extended through an opening in the clutch housing. The ratchet wheel 7 0 of the counter clear-out-clutch is secured to the shaft 62 while the ratchet wheel of the accumulator clear-out clutch is secured to a hub of the gear 61, so that these ratchets turn in opposite directions when the motor is running. The clutch housing 67 of the counter clear-out clutch is secured to a gear 71 which meshes with the gear 52 above described, while a gear 72 attached to the accumulator clear-out clutch housing 68 is adapted to mesh a gear Gears 71 and 72 are mutilated, and the gear tooth of each of the gears 52 and 53 which normally stands in the mutilated portion of gears 71 and 72 respectively is made somewhat shorter. The number of teeth on each of the gears 71 and 72 exceeds the number of teeth on the respective gears 52 and 53 by one tooth so that upon making one rotation of either the gear 71 or the gear 72 the corresponding gear 52 and 53 will be given slightly more than a complete revolution whereby the clearing shaft 33 will be turned slightly beyond its full 4 cycle position. Means will be described hereinafter for turning the shaft 33 to its full cycle position after it has been. given this slight increment ofmovement beyond that position.

The pawl 69 of clutch housing 67 is controlled by a clutch control lever 73 formed at its end with a finger which normally engages the clutch pawl thereof to disengage the same from the cooperative ratchet. The lever 73 is pivoted on a shaft 74 and its lower arm extends forwardly in the machine and is then bent upwardly and engaged by the shank 75 of a counter clear key 76 mounted .on the keyboard. Depression of the counter clear key 76 rocks the clutch control lever 73 thereby clutching the housing 67 to the shaft 62. As this shaft is being constantly rotated during operation of the motor the clutch housing and its connected gear 71 are caused to rotate with the shaft 62. The rotation of gear 71 causes gear 52 to rotate slightly over one complete revolution and thereby drive gear which rotates gear 43 on the hinge rod 39. This in turn causes gear 38 to rotate gear 37, stub shaft 36 and gear 35, the latter in turn rotating gear 34, which causes rotation of the clearing shaft 33 in a clockwise direction as viewed from the right-hand side of the machine whereby counters 27 and 28 are cleared. The hinge rod 39 is given slightly more than a complete revolution so as to insure complete clearing of the counters, and is then brought back to full cycle condition by means which will presently be described.

Pivotally supported on rod 74 is an accumulator clear-out clutch control lever 77, this lever being formed with a yoke 78 at its pivotal connection with the pivot rod. The for wardly extending arm 79 of this lever enters a slot in the stem 80 of an accumulator clearout key 81. The up-standing arm of lever 77 engages the pawl of the accumulator clearout clutch and holds it out of engagement with its ratchet wheel.

When key 81 is depressed, it rocks lever 77 so as to permit engagement of the pawl and ratchet of the accumulator clear-out clutch and as this ratchet is turned by gear 61, the clutch housing 68 and connected gear 72 are turned in the opposite direction from 67 and 71 when they are active. Gear 72 drives gear 53 and thereby gear's50 and 43, the hinge rod 39 and the gear train to clear shaft 33. This connection, however, turns clear shaft 33 counter-clockwise which effects the clearing of the accumulators 26. As in the counter clear-out, so in the accumulator clear-out, shaft 33 is turned slightly beyond full-cycle position and then returned by means which will now be described.

Secured to the side of gear 43 is a cam 82 the periphery of which is concentric with hinge rod 39 for most of its extent. It is, however, formed'with a notch 83 having inclined sides, as seen in Figs. 2 and 10. Pivvoted on the sub-frame 46 is a lever 84 carrying a roller 85 which rides on the periphery of cam 82 and normally stands in the notch 83 holding the clearing shaft in full-cycle position. A spring 86 holds lever 84 so as to maintain engagement of roller 85 with cam 82. When the motor drives the shaft 39 for clearing, the cam 82 is driven slightly more than a full cycle, and then upon the release of the active clear-out clutch, the roller 85 acts on the inclined side of notch 83, to return the hinge rod and connected parts to full-cycle position.

It may be desired to clear both the counters and the accumulators with a single manipulation, and for this purpose, there is provided a key 87, the stem 88 of which engages the forwardly extending arm 89 of a lever pivoted on rod 74. The upwardly extending arm 90 of this lever normally engages the ratchet pawl of a clutch housing 91 on a stub-shaft 92 having hearings in the frame 46 and a bracket 93. Shaft 92 has secured to it a gear 94 which meshes with an idler 101 driven by gear 66, the gear ratios being such that shaft 62 is given somewhat more than two rotations to every rotation of stub-shaft 92. When the key 87 is depressed the housing 91 is clutched to the stub-shaft 92, the details of all three of the clutches being the same.

The housing 91 has attached to it at oppo-- site sides cams 95 and 96, the beginning of the rise of cam 96 being normally in contact with a roller 97 carried by an arm 98 of the yoke 7 8; and the cam 95 being adapted to engage a roller 99 carried by rock-lever 73. As soon as housing 91 is clutched to shaft 92, cam 96 forces roller 97 forwardly which rocks lever 77 to render the accumulator clear-out clutch effective. By the time the accumula tors have been cleared, cam 96 has released roller 97 and the associated parts return to normal upon the completion of the clearing of the accumulators. As soon as the accumulator clearing operation is completed, cam 95 takes effect on roller 99 thereby rocking lever 73 to render the counter clear-out clutch effective. By the time that the counters have been cleared, the clutch casing 91 has been rotated to normal and this multiple clear-out clutch has been rendered ineffective.

It will of course be understood that the keys and associated parts are returned to normal by suitable springs such as shown at 100 in Figure-3. It will also be understood that while a clearing handle is shown at 32 this is not essential and is included merely to more clearly bring out the operation of the devices, although, of course, it may be retained as an optional clearing means.

While I have described what I consider to be the most desirable embodiment of my invention, it is obvious that many chan es could be made without departing from t e spirit Gil of my invention, and I, therefore, do not limit myself to the exact construction shown nor to anything less than the Whole of my invention as hereinbefore described, and as hereinafter claimed.

I claim:

1. In acalculating machine having a set of accumulators, a set of counters, a motor for operating said accumulators and counters, and clearing devices common to said accumulators and counters, the combination of a key for connecting said motor to said clearing devices for eil'ecting clearing of said accumulators, a key for connecting said motor to said clearing devices for effecting clearing of said counters, and a key operable to effect operation of the first and second said keys one after the other.

2. In a calculating machine, having a plurality of registers, means for actuating said registers in effecting mathematical computations, and a clearing shaft rotatable in one direction for clearing one of said registers and in the reverse direction for clearing another of said registers, the combination of a motor and means for effecting connection of said motor to said shaft for driving the shaft first in one direction and'then in the other.

3. in a calculatingmachine, having a plurality of registers, means for actuating said registers in effecting mathematical computations, anc a clearing shaft rotatable in one direction for clearing one of said registers and in the reverse direction for clearing another of said registers, the combination of a motor, means for connecting said motor to drive said shaft in either direction at the Will of the operator, and means cooperative with said connecting means for effecting driving of said shaft first in one direction and then in the reverse direction.

l. in a calculating machine having a plurality of registers, actuating means for said registers, an electric motor for driving said actuating means, and clearing devices for said registers, the combination of a plurality of clutches cooperative with said motor and each operable to efi ect operation of said devices for clearing of a respective register, and a clutch cooperative with said motor for rendering said plurality of clutches effective se riatim.

5. In a calculating machine, having a plurality of registers, actuating means for said registers, an electric motor for driving said actuating means, and clearing devices for said registers, the combination of a plurality of clutches cooperative with said motor and each operable to ellect operation of said devices for clearing of a respective register, and a key operable f r effecting operatlon of said clutches seriatim.

In testimony whereof I allix my signature.

anonrnns s. DENNIS. 

